<!doctype html>
<title>Video width and height attributes are used to infer aspect-ratio</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/media.js"></script>
<script src="resources/aspect-ratio.js"></script>
<style>
  video {
    width: 100%;
    max-width: 100px;
    height: auto;
  }
</style>
<body>
<video width="250" height="100" id="contained" style="contain: size;"></video>
<script>
function assert_ratio(img, expected) {
  let epsilon = 0.001;
  assert_approx_equals(parseInt(getComputedStyle(img).width, 10) / parseInt(getComputedStyle(img).height, 10), expected, epsilon);
}

function test_computed_style(width, height, expected) {
  test_computed_style_aspect_ratio("video", {width: width, height: height}, expected);
}

promise_test(async function() {
  {
    let video = document.getElementById("contained");
    video.src = getVideoURI('/media/2x2-green');
    assert_ratio(video, 2.5, "contain:size aspect ratio");
  }

  // Create and append a new video and immediately check the ratio.
  // This is not racy because the spec requires the user agent to queue a task:
  // https://html.spec.whatwg.org/multipage/media.html#concept-media-load-algorithm
  {
    let video = document.createElement("video");
    video.setAttribute("width", "250");
    video.setAttribute("height", "100");
    video.src = getVideoURI('/media/2x2-green');
    document.body.appendChild(video);
    assert_ratio(video, 2.5, "aspect ratio for regular video before load");
    await new Promise(r => video.addEventListener("loadeddata", r, { once: true }));
    // When loaded this video is square.
    assert_ratio(video, 1, "aspect ratio for regular video after load");
  }

  // Same but with auto width.
  {
    let video = document.createElement("video");
    video.setAttribute("width", "250");
    video.setAttribute("height", "100");
    video.style.width = "auto";
    video.src = getVideoURI('/media/2x2-green');
    document.body.appendChild(video);
    assert_ratio(video, 2.5, "aspect ratio for regular video with width: auto before load");
    await new Promise(r => video.addEventListener("loadeddata", r, { once: true }));
    assert_ratio(video, 1, "aspect ratio for regular video with width: auto after load");
  }

  test_computed_style("10", "20", "auto 10 / 20");
  test_computed_style("0.5", "1.5", "auto 0.5 / 1.5");
  test_computed_style("0", "1", "auto 0 / 1");
  test_computed_style("1", "0", "auto 1 / 0");
  test_computed_style("0", "0", "auto 0 / 0");
  test_computed_style(null, null, "auto");
  test_computed_style("10", null, "auto");
  test_computed_style(null, "20", "auto");
  test_computed_style("xx", "20", "auto");
  test_computed_style("10%", "20", "auto");
});
</script>
